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Finding the Fourth Proportional to 14,978.92, 20,667.22 and 9,156.55

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Solution

The fourth proportional to 14,978.92, 20,667.22 and 9,156.55 is: 12,633.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,978.92 : 20,667.22 = 9,156.55 : x
  2. Step 2: Convert to fraction form
    14,978.92/20,667.22 = 9,156.55/x
  3. Step 3: Cross multiply
    14,978.92x = 20,667.22 × 9,156.55
  4. Step 4: Simplify right side
    14,978.92x = 189,240,433.29
  5. Step 5: Solve for x
    x = 189,240,433.29/14,978.92
  6. Step 6: Final answer
    x = 12,633.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.